package com.example.demo.webSocket;


import com.example.demo.pojo.ChatMessage;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Component;

import javax.websocket.Session;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint(value = "/websocket/{nickname}")
@Component
public class MyWebSocket {
    //用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    private String nickname;
//    private static Map<String,Session> map = new HashMap<String, Session>();
    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session,@PathParam("nickname") String nickname) {
        this.session = session;
        this.nickname=nickname;
        webSocketSet.add(this);     //加入set中
        System.out.println("有新连接加入:"+nickname+",当前在线人数为" + webSocketSet.size());
        this.session.getAsyncRemote().sendText("恭喜您成功连接上WebSocket-->当前在线人数为："+webSocketSet.size());
    }
    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        System.out.println("有一连接关闭！当前在线人数为" + webSocketSet.size());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session,@PathParam("nickname") String nickname) {
        ObjectMapper mapper = new ObjectMapper();
        ChatMessage chatMessage;
        try {
            //readValue()Decoding by method
             chatMessage = mapper.readValue(message, ChatMessage.class);
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("来自客户端的消息-->"+nickname+": " + message);
        //群发消息
        broadcast(message);

    }
    /**
     * 发生错误时调用
     *
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }
    /**
     * 群发自定义消息
     * */
    public  void broadcast(String message){
        for (MyWebSocket item : webSocketSet) {
            //同步异步说明参考：http://blog.csdn.net/who_is_xiaoming/article/details/53287691
            //this.session.getBasicRemote().sendText(message);
            item.session.getAsyncRemote().sendText(message);//异步发送消息.
        }
    }

}
